Backup Exec 2010 fresh install on new server questions

I am in the process of creating a new server to put backup exec on. I want to do a fresh start to backup exec and not migrate anything over from the old back exec 2010 version. I am creating it on a windows 2008 sp2 64 bit server. The original server is a 2003 storage windows server 32 bit. So my questions are.
1. After installing BE210 on the new server can I just use the trial version until I take my licenses off the old server or will I need to install those license keys when I first install BE2010 on the new server. Which way is the best way to do it? Do I just remove them off the current server and install them on the new one? Or is there a proper proceedure to remove license keys to reuse them. Do I need to uninstall the remote agents off the machines they are and reinstall them when I want them to see the new BE2010 server?
2. I will be migrating to exchange 2010 in the future. Will the windows 2008 SP2 64 bit be the right OS for the exchange 2010 or should I just install the windows 2008 R2 64 version instead. I know that exchange 2010 will need backup exec on a 64 bit machine.

I would leave the existing installation in case something goes wrong.
You might be able to update the remote agents to point to the new media server. If you can't re-point them I would personally uninstall/reinstall

You might be able to update the remote agents to point to the new media server. If you can't re-point them I would personally uninstall/reinstall from the new media server but it looks like from this article below you might be able to change it?

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